//
// assembly portion of the IA64 MCA handling
//
// Mods by cfleck to integrate into kernel build
// 00/03/15 davidm Added various stop bits to get a clean compile
//
// 00/03/29 cfleck Added code to save INIT handoff state in pt_regs format, switch to temp
//		   kstack, switch modes, jump to C INIT handler
//
// 02/01/04 J.Hall <jenna.s.hall@intel.com>
//		   Before entering virtual mode code:
//		   1. Check for TLB CPU error
//		   2. Restore current thread pointer to kr6
//		   3. Move stack ptr 16 bytes to conform to C calling convention
//
#include <linux/config.h>

#include <asm/asmmacro.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/mca_asm.h>
#include <asm/mca.h>

/*
 * When we get an machine check, the kernel stack pointer is no longer
 * valid, so we need to set a new stack pointer.
 */
#define	MINSTATE_PHYS	/* Make sure stack access is physical for MINSTATE */

/*
 * Needed for ia64_sal call
 */
#define SAL_GET_STATE_INFO      0x01000001

/*
 * Needed for return context to SAL
 */
#define IA64_MCA_SAME_CONTEXT	0x0
#define IA64_MCA_COLD_BOOT	-2

#include "minstate.h"

/*
 * SAL_TO_OS_MCA_HANDOFF_STATE (SAL 3.0 spec)
 *		1. GR1 = OS GP
 *		2. GR8 = PAL_PROC physical address
 *		3. GR9 = SAL_PROC physical address
 *		4. GR10 = SAL GP (physical)
 *		5. GR11 = Rendez state
 *		6. GR12 = Return address to location within SAL_CHECK
 */
#define SAL_TO_OS_MCA_HANDOFF_STATE_SAVE(_tmp)		\
	LOAD_PHYSICAL(p0, _tmp, ia64_sal_to_os_handoff_state);; \
	st8	[_tmp]=r1,0x08;;			\
	st8	[_tmp]=r8,0x08;;			\
	st8	[_tmp]=r9,0x08;;			\
	st8	[_tmp]=r10,0x08;;			\
	st8	[_tmp]=r11,0x08;;			\
	st8	[_tmp]=r12,0x08;;			\
	st8	[_tmp]=r17,0x08;;			\
	st8	[_tmp]=r18,0x08

/*
 * OS_MCA_TO_SAL_HANDOFF_STATE (SAL 3.0 spec)
 * (p6) is executed if we never entered virtual mode (TLB error)
 * (p7) is executed if we entered virtual mode as expected (normal case)
 *	1. GR8 = OS_MCA return status
 *	2. GR9 = SAL GP (physical)
 *	3. GR10 = 0/1 returning same/new context
 *	4. GR22 = New min state save area pointer
 *	returns ptr to SAL rtn save loc in _tmp
 */
#define OS_MCA_TO_SAL_HANDOFF_STATE_RESTORE(_tmp)	\
	LOAD_PHYSICAL(p6, _tmp, ia64_sal_to_os_handoff_state);; \
	LOAD_PHYSICAL(p7, _tmp, ia64_os_to_sal_handoff_state);; \
(p6)	movl	r8=IA64_MCA_COLD_BOOT;			\
(p6)	movl	r10=IA64_MCA_SAME_CONTEXT;		\
(p6)	add     _tmp=0x18,_tmp;;			\
(p6)	ld8	r9=[_tmp],0x10;				\
(p6)	movl	r22=ia64_mca_min_state_save_info;;	\
(p7)	ld8	r8=[_tmp],0x08;;			\
(p7)	ld8	r9=[_tmp],0x08;;			\
(p7)	ld8     r10=[_tmp],0x08;;			\
(p7)	ld8     r22=[_tmp],0x08;;			\
	DATA_VA_TO_PA(r22)
	// now _tmp is pointing to SAL rtn save location


	.global ia64_os_mca_dispatch
	.global ia64_os_mca_dispatch_end
	.global ia64_sal_to_os_handoff_state
	.global	ia64_os_to_sal_handoff_state
	.global	ia64_mca_proc_state_dump
	.global	ia64_mca_stack
	.global	ia64_mca_stackframe
	.global	ia64_mca_bspstore
	.global ia64_init_stack
	.global ia64_mca_sal_data_area
	.global ia64_tlb_functional
	.global ia64_mca_min_state_save_info

	.text
	.align 16

ia64_os_mca_dispatch:

#if defined(MCA_TEST)
	// Pretend that we are in interrupt context
	mov		r2=psr
	dep		r2=0, r2, PSR_IC, 2;
	mov		psr.l = r2
#endif	/* #if defined(MCA_TEST) */

	// Save the SAL to OS MCA handoff state as defined
	// by SAL SPEC 3.0
	// NOTE : The order in which the state gets saved
	//	  is dependent on the way the C-structure
	//	  for ia64_mca_sal_to_os_state_t has been
	//	  defined in include/asm/mca.h
	SAL_TO_OS_MCA_HANDOFF_STATE_SAVE(r2)
	;;

	// LOG PROCESSOR STATE INFO FROM HERE ON..
begin_os_mca_dump:
	br	ia64_os_mca_proc_state_dump;;

ia64_os_mca_done_dump:

	// Setup new stack frame for OS_MCA handling
	movl	r2=ia64_mca_bspstore;;	// local bspstore area location in r2
	DATA_VA_TO_PA(r2);;
	movl	r3=ia64_mca_stackframe;; // save stack frame to memory in r3
	DATA_VA_TO_PA(r3);;
	rse_switch_context(r6,r3,r2);;	// RSC management in this new context
	movl	r12=ia64_mca_stack
	mov	r2=8*1024;;		// stack size must be same as C array
	add	r12=r2,r12;;		// stack base @ bottom of array
	adds	r12=-16,r12;;		// allow 16 bytes of scratch
					// (C calling convention)
	DATA_VA_TO_PA(r12);;

	// Check to see if the MCA resulted from a TLB error
begin_tlb_error_check:
        br      ia64_os_mca_tlb_error_check;;

done_tlb_error_check:

        // If TLB is functional, enter virtual mode from physical mode
	VIRTUAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_begin, r4)
ia64_os_mca_virtual_begin:

	// call our handler
	movl		r2=ia64_mca_ucmc_handler;;
	mov		b6=r2;;
	br.call.sptk.many    b0=b6;;
.ret0:
	// Revert back to physical mode before going back to SAL
	PHYSICAL_MODE_ENTER(r2, r3, ia64_os_mca_virtual_end, r4)
ia64_os_mca_virtual_end:

#if defined(MCA_TEST)
	// Pretend that we are in interrupt context
	mov	r2=psr;;
	dep	r2=0, r2, PSR_IC, 2;;
	mov	psr.l = r2;;
#endif	/* #if defined(MCA_TEST) */

	// restore the original stack frame here
	movl    r2=ia64_mca_stackframe	// restore stack frame from memory at r2
	;;
	DATA_VA_TO_PA(r2)
	movl    r4=IA64_PSR_MC
	;;
	rse_return_context(r4,r3,r2)	// switch from interrupt context for RSE

	// let us restore all the registers from our PSI structure
	mov	r8=gp
	;;
begin_os_mca_restore:
	br	ia64_os_mca_proc_state_restore;;

ia64_os_mca_done_restore:
	movl	r3=ia64_tlb_functional;;
	DATA_VA_TO_PA(r3);;
	ld8	r3=[r3];;
	cmp.eq	p6,p7=r0,r3;;
	OS_MCA_TO_SAL_HANDOFF_STATE_RESTORE(r2);;
	// branch back to SALE_CHECK
	ld8		r3=[r2];;
	mov		b0=r3;;		// SAL_CHECK return address
	br		b0
	;;
ia64_os_mca_dispatch_end:
//EndMain//////////////////////////////////////////////////////////////////////


//++
// Name:
//      ia64_os_mca_proc_state_dump()
//
// Stub Description:
//
//       This stub dumps the processor state during MCHK to a data area
//
//--

ia64_os_mca_proc_state_dump:
// Save bank 1 GRs 16-31 which will be used by c-language code when we switch
//  to virtual addressing mode.
	movl		r2=ia64_mca_proc_state_dump;;           // Os state dump area
        DATA_VA_TO_PA(r2)                   // convert to to physical address

// save ar.NaT
	mov		r5=ar.unat                  // ar.unat

// save banked GRs 16-31 along with NaT bits
	bsw.1;;
	st8.spill	[r2]=r16,8;;
	st8.spill	[r2]=r17,8;;
	st8.spill	[r2]=r18,8;;
	st8.spill	[r2]=r19,8;;
	st8.spill	[r2]=r20,8;;
	st8.spill	[r2]=r21,8;;
	st8.spill	[r2]=r22,8;;
	st8.spill	[r2]=r23,8;;
	st8.spill	[r2]=r24,8;;
	st8.spill	[r2]=r25,8;;
	st8.spill	[r2]=r26,8;;
	st8.spill	[r2]=r27,8;;
	st8.spill	[r2]=r28,8;;
	st8.spill	[r2]=r29,8;;
	st8.spill	[r2]=r30,8;;
	st8.spill	[r2]=r31,8;;

	mov		r4=ar.unat;;
	st8		[r2]=r4,8                // save User NaT bits for r16-r31
	mov		ar.unat=r5                  // restore original unat
	bsw.0;;

//save BRs
	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2                // duplicate r2 in r4

	mov		r3=b0
	mov		r5=b1
	mov		r7=b2;;
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=b3
	mov		r5=b4
	mov		r7=b5;;
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=b6
	mov		r5=b7;;
	st8		[r2]=r3,2*8
	st8		[r4]=r5,2*8;;

cSaveCRs:
// save CRs
	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2                // duplicate r2 in r4

	mov		r3=cr0                      // cr.dcr
	mov		r5=cr1                      // cr.itm
	mov		r7=cr2;;                    // cr.iva

	st8		[r2]=r3,8*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;            // 48 byte rements

	mov		r3=cr8;;                    // cr.pta
	st8		[r2]=r3,8*8;;            // 64 byte rements

// if PSR.ic=0, reading interruption registers causes an illegal operation fault
	mov		r3=psr;;
	tbit.nz.unc	p6,p0=r3,PSR_IC;;           // PSI Valid Log bit pos. test
(p6)    st8     [r2]=r0,9*8+160             // increment by 232 byte inc.
begin_skip_intr_regs:
(p6)	br		SkipIntrRegs;;

	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2                // duplicate r2 in r6

	mov		r3=cr16                     // cr.ipsr
	mov		r5=cr17                     // cr.isr
        mov     r7=r0;;                     // cr.ida => cr18 (reserved)
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=cr19                     // cr.iip
	mov		r5=cr20                     // cr.idtr
	mov		r7=cr21;;                   // cr.iitr
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=cr22                     // cr.iipa
	mov		r5=cr23                     // cr.ifs
	mov		r7=cr24;;                   // cr.iim
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=cr25;;                   // cr.iha
	st8		[r2]=r3,160;;               // 160 byte rement

SkipIntrRegs:
	st8		[r2]=r0,168                 // another 168 byte .

	mov		r3=cr66;;                   // cr.lid
	st8		[r2]=r3,40                  // 40 byte rement

	mov		r3=cr71;;                   // cr.ivr
	st8		[r2]=r3,8

	mov		r3=cr72;;                   // cr.tpr
	st8		[r2]=r3,24                  // 24 byte increment

	mov		r3=r0;;                     // cr.eoi => cr75
	st8		[r2]=r3,168                 // 168 byte inc.

	mov		r3=r0;;                     // cr.irr0 => cr96
	st8		[r2]=r3,16               // 16 byte inc.

	mov		r3=r0;;                     // cr.irr1 => cr98
	st8		[r2]=r3,16               // 16 byte inc.

	mov		r3=r0;;                     // cr.irr2 => cr100
	st8		[r2]=r3,16               // 16 byte inc

	mov		r3=r0;;                     // cr.irr3 => cr100
	st8		[r2]=r3,16               // 16b inc.

	mov		r3=r0;;                     // cr.itv => cr114
	st8		[r2]=r3,16               // 16 byte inc.

	mov		r3=r0;;                     // cr.pmv => cr116
	st8		[r2]=r3,8

	mov		r3=r0;;                     // cr.lrr0 => cr117
	st8		[r2]=r3,8

	mov		r3=r0;;                     // cr.lrr1 => cr118
	st8		[r2]=r3,8

	mov		r3=r0;;                     // cr.cmcv => cr119
	st8		[r2]=r3,8*10;;

cSaveARs:
// save ARs
	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2                // duplicate r2 in r6

	mov		r3=ar0                      // ar.kro
	mov		r5=ar1                      // ar.kr1
	mov		r7=ar2;;                    // ar.kr2
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=ar3                      // ar.kr3
	mov		r5=ar4                      // ar.kr4
	mov		r7=ar5;;                    // ar.kr5
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=ar6                      // ar.kr6
	mov		r5=ar7                      // ar.kr7
	mov		r7=r0;;                     // ar.kr8
	st8		[r2]=r3,10*8
	st8		[r4]=r5,10*8
	st8		[r6]=r7,10*8;;           // rement by 72 bytes

	mov		r3=ar16                     // ar.rsc
	mov		ar16=r0			    // put RSE in enforced lazy mode
	mov		r5=ar17                     // ar.bsp
	;;
	mov		r7=ar18;;                   // ar.bspstore
	st8		[r2]=r3,3*8
	st8		[r4]=r5,3*8
	st8		[r6]=r7,3*8;;

	mov		r3=ar19;;                   // ar.rnat
	st8		[r2]=r3,8*13             // increment by 13x8 bytes

	mov		r3=ar32;;                   // ar.ccv
	st8		[r2]=r3,8*4

	mov		r3=ar36;;                   // ar.unat
	st8		[r2]=r3,8*4

	mov		r3=ar40;;                   // ar.fpsr
	st8		[r2]=r3,8*4

	mov		r3=ar44;;                   // ar.itc
	st8		[r2]=r3,160                 // 160

	mov		r3=ar64;;                   // ar.pfs
	st8		[r2]=r3,8

	mov		r3=ar65;;                   // ar.lc
	st8		[r2]=r3,8

	mov		r3=ar66;;                   // ar.ec
	st8		[r2]=r3
	add		r2=8*62,r2               //padding

// save RRs
	mov		ar.lc=0x08-1
	movl		r4=0x00;;

cStRR:
	mov		r3=rr[r4];;
	st8		[r2]=r3,8
	add		r4=1,r4
	br.cloop.sptk.few	cStRR
	;;
end_os_mca_dump:
	br	ia64_os_mca_done_dump;;

//EndStub//////////////////////////////////////////////////////////////////////


//++
// Name:
//       ia64_os_mca_proc_state_restore()
//
// Stub Description:
//
//       This is a stub to restore the saved processor state during MCHK
//
//--

ia64_os_mca_proc_state_restore:

// Restore bank1 GR16-31
	movl		r2=ia64_mca_proc_state_dump	// Convert virtual address
	;;						// of OS state dump area
	DATA_VA_TO_PA(r2)				// to physical address

restore_GRs:                                    // restore bank-1 GRs 16-31
	bsw.1;;
	add		r3=16*8,r2;;                // to get to NaT of GR 16-31
	ld8		r3=[r3];;
	mov		ar.unat=r3;;                // first restore NaT

	ld8.fill	r16=[r2],8;;
	ld8.fill	r17=[r2],8;;
	ld8.fill	r18=[r2],8;;
	ld8.fill	r19=[r2],8;;
	ld8.fill	r20=[r2],8;;
	ld8.fill	r21=[r2],8;;
	ld8.fill	r22=[r2],8;;
	ld8.fill	r23=[r2],8;;
	ld8.fill	r24=[r2],8;;
	ld8.fill	r25=[r2],8;;
	ld8.fill	r26=[r2],8;;
	ld8.fill	r27=[r2],8;;
	ld8.fill	r28=[r2],8;;
	ld8.fill	r29=[r2],8;;
	ld8.fill	r30=[r2],8;;
	ld8.fill	r31=[r2],8;;

	ld8		r3=[r2],8;;              // increment to skip NaT
	bsw.0;;

restore_BRs:
	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2;;              // duplicate r2 in r4

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		b0=r3
	mov		b1=r5
	mov		b2=r7;;

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		b3=r3
	mov		b4=r5
	mov		b5=r7;;

	ld8		r3=[r2],2*8
	ld8		r5=[r4],2*8;;
	mov		b6=r3
	mov		b7=r5;;

restore_CRs:
	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2;;              // duplicate r2 in r4

	ld8		r3=[r2],8*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;            // 48 byte increments
	mov		cr0=r3                      // cr.dcr
	mov		cr1=r5                      // cr.itm
	mov		cr2=r7;;                    // cr.iva

	ld8		r3=[r2],8*8;;            // 64 byte increments
//      mov		cr8=r3                      // cr.pta


// if PSR.ic=1, reading interruption registers causes an illegal operation fault
	mov		r3=psr;;
	tbit.nz.unc	p6,p0=r3,PSR_IC;;           // PSI Valid Log bit pos. test
(p6)    st8     [r2]=r0,9*8+160             // increment by 232 byte inc.

begin_rskip_intr_regs:
(p6)	br		rSkipIntrRegs;;

	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2;;              // duplicate r2 in r4

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		cr16=r3                     // cr.ipsr
	mov		cr17=r5                     // cr.isr is read only
//      mov     cr18=r7;;                   // cr.ida (reserved - don't restore)

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		cr19=r3                     // cr.iip
	mov		cr20=r5                     // cr.idtr
	mov		cr21=r7;;                   // cr.iitr

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		cr22=r3                     // cr.iipa
	mov		cr23=r5                     // cr.ifs
	mov		cr24=r7                     // cr.iim

	ld8		r3=[r2],160;;               // 160 byte increment
	mov		cr25=r3                     // cr.iha

rSkipIntrRegs:
	ld8		r3=[r2],168;;               // another 168 byte inc.

	ld8		r3=[r2],40;;                // 40 byte increment
	mov		cr66=r3                     // cr.lid

	ld8		r3=[r2],8;;
//      mov		cr71=r3                     // cr.ivr is read only
	ld8		r3=[r2],24;;                // 24 byte increment
	mov		cr72=r3                     // cr.tpr

	ld8		r3=[r2],168;;               // 168 byte inc.
//      mov		cr75=r3                     // cr.eoi

	ld8		r3=[r2],16;;             // 16 byte inc.
//      mov		cr96=r3                     // cr.irr0 is read only

	ld8		r3=[r2],16;;             // 16 byte inc.
//      mov		cr98=r3                     // cr.irr1 is read only

	ld8		r3=[r2],16;;             // 16 byte inc
//      mov		cr100=r3                    // cr.irr2 is read only

	ld8		r3=[r2],16;;             // 16b inc.
//      mov		cr102=r3                    // cr.irr3 is read only

	ld8		r3=[r2],16;;             // 16 byte inc.
//      mov		cr114=r3                    // cr.itv

	ld8		r3=[r2],8;;
//      mov		cr116=r3                    // cr.pmv
	ld8		r3=[r2],8;;
//      mov		cr117=r3                    // cr.lrr0
	ld8		r3=[r2],8;;
//      mov		cr118=r3                    // cr.lrr1
	ld8		r3=[r2],8*10;;
//      mov		cr119=r3                    // cr.cmcv

restore_ARs:
	add		r4=8,r2                  // duplicate r2 in r4
	add		r6=2*8,r2;;              // duplicate r2 in r4

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		ar0=r3                      // ar.kro
	mov		ar1=r5                      // ar.kr1
	mov		ar2=r7;;                    // ar.kr2

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
	mov		ar3=r3                      // ar.kr3
	mov		ar4=r5                      // ar.kr4
	mov		ar5=r7;;                    // ar.kr5

	ld8		r3=[r2],10*8
	ld8		r5=[r4],10*8
	ld8		r7=[r6],10*8;;
	mov		ar6=r3                      // ar.kr6
	mov		ar7=r5                      // ar.kr7
//      mov		ar8=r6                      // ar.kr8
	;;

	ld8		r3=[r2],3*8
	ld8		r5=[r4],3*8
	ld8		r7=[r6],3*8;;
//      mov		ar16=r3                     // ar.rsc
//      mov		ar17=r5                     // ar.bsp is read only
	mov		ar16=r0			    // make sure that RSE is in enforced lazy mode
	;;
	mov		ar18=r7;;                   // ar.bspstore

	ld8		r9=[r2],8*13;;
	mov		ar19=r9                     // ar.rnat

	mov		ar16=r3			    // ar.rsc
	ld8		r3=[r2],8*4;;
	mov		ar32=r3                     // ar.ccv

	ld8		r3=[r2],8*4;;
	mov		ar36=r3                     // ar.unat

	ld8		r3=[r2],8*4;;
	mov		ar40=r3                     // ar.fpsr

	ld8		r3=[r2],160;;               // 160
//      mov		ar44=r3                     // ar.itc

	ld8		r3=[r2],8;;
	mov		ar64=r3                     // ar.pfs

	ld8		r3=[r2],8;;
	mov		ar65=r3                     // ar.lc

	ld8		r3=[r2];;
	mov		ar66=r3                     // ar.ec
	add		r2=8*62,r2;;             // padding

restore_RRs:
	mov		r5=ar.lc
	mov		ar.lc=0x08-1
	movl		r4=0x00
cStRRr:
	ld8		r3=[r2],8;;
//      mov		rr[r4]=r3                   // what are its access previledges?
	add		r4=1,r4
	br.cloop.sptk.few	cStRRr
	;;
	mov		ar.lc=r5
	;;
end_os_mca_restore:
	br	ia64_os_mca_done_restore;;

//EndStub//////////////////////////////////////////////////////////////////////

//++
// Name:
//	ia64_os_mca_tlb_error_check()
//
// Stub Description:
//
//	This stub checks to see if the MCA resulted from a TLB error
//
//--

ia64_os_mca_tlb_error_check:

	// Retrieve sal data structure for uncorrected MCA

	// Make the ia64_sal_get_state_info() call
	movl	r4=ia64_mca_sal_data_area;;
	movl	r7=ia64_sal;;
	mov	r6=r1			// save gp
	DATA_VA_TO_PA(r4)		// convert to physical address
	DATA_VA_TO_PA(r7);;		// convert to physical address
	ld8	r7=[r7]			// get addr of pdesc from ia64_sal
	movl	r3=SAL_GET_STATE_INFO;;
	DATA_VA_TO_PA(r7);;		// convert to physical address
	ld8	r8=[r7],8;;		// get pdesc function pointer
	dep	r8=0,r8,61,3;;		// convert SAL VA to PA
	ld8	r1=[r7];;		// set new (ia64_sal) gp
	dep	r1=0,r1,61,3;;		// convert SAL VA to PA
	mov	b6=r8

	alloc	r5=ar.pfs,8,0,8,0;;	// allocate stack frame for SAL call
	mov	out0=r3			// which SAL proc to call
	mov	out1=r0			// error type == MCA
	mov	out2=r0			// null arg
	mov	out3=r4			// data copy area
	mov	out4=r0			// null arg
	mov	out5=r0			// null arg
	mov	out6=r0			// null arg
	mov	out7=r0;;		// null arg

	br.call.sptk.few	b0=b6;;

	mov	r1=r6			// restore gp
	mov	ar.pfs=r5;;		// restore ar.pfs

	movl	r6=ia64_tlb_functional;;
	DATA_VA_TO_PA(r6)		// needed later

	cmp.eq	p6,p7=r0,r8;;		// check SAL call return address
(p7)	st8	[r6]=r0			// clear tlb_functional flag
(p7)    br	tlb_failure		// error; return to SAL

	// examine processor error log for type of error
	add	r4=40+24,r4;;		// parse past record header (length=40)
					// and section header (length=24)
	ld4	r4=[r4]			// get valid field of processor log
	mov	r5=0xf00;;
	and	r5=r4,r5;;		// read bits 8-11 of valid field
					// to determine if we have a TLB error
	movl	r3=0x1
	cmp.eq	p6,p7=r0,r5;;
	// if no TLB failure, set tlb_functional flag
(p6)	st8	[r6]=r3
	// else clear flag
(p7)	st8	[r6]=r0

	// if no TLB failure, continue with normal virtual mode logging
(p6)    br	done_tlb_error_check
	// else no point in entering virtual mode for logging
tlb_failure:
	br      ia64_os_mca_virtual_end

//EndStub//////////////////////////////////////////////////////////////////////


// ok, the issue here is that we need to save state information so
// it can be useable by the kernel debugger and show regs routines.
// In order to do this, our best bet is save the current state (plus
// the state information obtain from the MIN_STATE_AREA) into a pt_regs
// format.  This way we can pass it on in a useable format.
//

//
// SAL to OS entry point for INIT on the monarch processor
// This has been defined for registration purposes with SAL
// as a part of ia64_mca_init.
//
// When we get here, the following registers have been
// set by the SAL for our use
//
//		1. GR1 = OS INIT GP
//		2. GR8 = PAL_PROC physical address
//		3. GR9 = SAL_PROC physical address
//		4. GR10 = SAL GP (physical)
//		5. GR11 = Init Reason
//			0 = Received INIT for event other than crash dump switch
//			1 = Received wakeup at the end of an OS_MCA corrected machine check
//			2 = Received INIT dude to CrashDump switch assertion
//
//		6. GR12 = Return address to location within SAL_INIT procedure


GLOBAL_ENTRY(ia64_monarch_init_handler)

	// stash the information the SAL passed to os
	SAL_TO_OS_MCA_HANDOFF_STATE_SAVE(r2)
	;;
	SAVE_MIN_WITH_COVER
	;;
	mov r8=cr.ifa
	mov r9=cr.isr
	adds r3=8,r2				// set up second base pointer
	;;
	SAVE_REST

// ok, enough should be saved at this point to be dangerous, and supply
// information for a dump
// We need to switch to Virtual mode before hitting the C functions.

	movl	r2=IA64_PSR_IT|IA64_PSR_IC|IA64_PSR_DT|IA64_PSR_RT|IA64_PSR_DFH|IA64_PSR_BN
	mov	r3=psr	// get the current psr, minimum enabled at this point
	;;
	or	r2=r2,r3
	;;
	movl	r3=IVirtual_Switch
	;;
	mov	cr.iip=r3	// short return to set the appropriate bits
	mov	cr.ipsr=r2	// need to do an rfi to set appropriate bits
	;;
	rfi
	;;
IVirtual_Switch:
	//
	// We should now be running virtual
	//
	// Let's call the C handler to get the rest of the state info
	//
	alloc r14=ar.pfs,0,0,2,0		// now it's safe (must be first in insn group!)
	;;
	adds out0=16,sp				// out0 = pointer to pt_regs
	;;
	DO_SAVE_SWITCH_STACK
	adds out1=16,sp				// out0 = pointer to switch_stack

	br.call.sptk.many rp=ia64_init_handler
.ret1:

return_from_init:
	br.sptk return_from_init
END(ia64_monarch_init_handler)

//
// SAL to OS entry point for INIT on the slave processor
// This has been defined for registration purposes with SAL
// as a part of ia64_mca_init.
//

GLOBAL_ENTRY(ia64_slave_init_handler)
1:	br.sptk 1b
END(ia64_slave_init_handler)
